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KPI Science News
ISSN 2617-5509 · e‑ISSN 2663-7472 Open Access · CC BY 4.0
Vol. · Issue 1 · 2020 Mar 6, 2020 article

NANOCOMPOSITES BASED ON TIO2-SNO2: INFLUENCE OF ACID-BASED AND STRUCTURAL-ADSORPTION PROPERTIES ON THE PHOTOCATALYTIC ACTIVITY

AK
Anastasiya S. Kutuzova Corresponding Igor Sikorsky Kyiv Polytechnic Institute, Ukraine Ukraine
TD
Tetiana A. Dontsova Igor Sikorsky Kyiv Polytechnic Institute, Ukraine Ukraine
OL
Olga V. Linyucheva Igor Sikorsky Kyiv Polytechnic Institute, Ukraine Ukraine
PublishedMar 6, 2020
PDF (Ukrainian)
KPISN 1 VOL · 1
VOL · ISS 1 · 2020 View issue

Abstract

Background. TiO 2 -SnO 2 nanocomposites receive a lot of attention due to their efficient application in heterogeneous photocatalysis. Coupling TiO 2 with SnO 2 contributes to the suppression of charge carriers’ recombination and enhances photocatalytic performance of the material. Although considerable research on TiO 2 -SnO 2 system has been conducted, there is still a great uncertainty about the most efficient ways of its synthesis, effective synthesis conditions and the most appropriate reagents. Objective. The purpose of the paper is comparison of two synthesis methods (hydrolytic and hydrothermal) and different precursors to obtain TiO 2 -SnO 2 composites; assessment of the influence of different factors on the final properties of photocatalysts. Methods. Synthesis of TiO 2 -SnO 2 nanocomposites allowed studying the effect of SnO 2 content on acid-base and structural-adsorption properties that eventually determine photocatalytic performance. Photocatalytic decomposition of organic dyes of various types (methylene blue and Congo red) was used to evaluate photoactivity of materials. Results. Both synthesis methods allowed obtaining of TiO 2 and TiO 2 -SnO 2 nanocomposites with crystallite size of 3–24 nm. Hydrolytic synthesis using TiCl 4 resulted in pure rutile TiO 2 , while hydrothermal synthesis using TTIP resulted in pure anatase TiO 2 . Addition of SnO 2 enhanced photocatalytic activity of the samples obtained by hydrothermal method – a sample with 1% SnO 2 exhibited photocatalytic activity 30% higher than pure TiO 2 sample. Conclusions. Samples obtained by hydrothermal method have both acidic and basic Brønsted sites and are universal sorbents and photocatalysts that remove cationic and anionic dyes. Composites obtained by hydrolytic method contain only basic Brønsted sites and are therefore active for cationic dyes. Surface properties of materials play a crucial role that ultimately determines photocatalytic activity of the materials.

Keywords

#Nanocomposites TiO2-SnO2 #Hydrolytic method #Hydrothermal method #Acidic-basic sites #Photocatalysis

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